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tty: serial: fsl_lpuart: disable Rx/Tx DMA in lpuart32_shutdown()

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[ Upstream commit 1d4bd0e4ae4ba95892bef919a8d4d3f08f122d7e ]

UARTBAUD_RDMAE and UARTBAUD_TDMAE are enabled in lpuart32_startup(), but
lpuart32_shutdown() not disable them, only free the dma ring buffer and
release the dma channels, so here disable the Rx/Tx DMA first in
lpuart32_shutdown().

Fixes: 42b68768e51b ("serial: fsl_lpuart: DMA support for 32-bit variant")
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20221125101953.18753-3-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sherry Sun 2022-11-25 18:19:52 +08:00 committed by Greg Kroah-Hartman
parent 707d954d9b
commit d5dcc89c8d
1 changed files with 5 additions and 0 deletions
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5
drivers/tty/serial/fsl_lpuart.c
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@ -1807,6 +1807,11 @@ static void lpuart32_shutdown(struct uart_port *port)
spin_lock_irqsave(&port->lock, flags);
/* disable Rx/Tx DMA */
temp = lpuart32_read(port, UARTBAUD);
temp &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE);
lpuart32_write(port, temp, UARTBAUD);
/* disable Rx/Tx and interrupts */
temp = lpuart32_read(port, UARTCTRL);
temp &= ~(UARTCTRL_TE | UARTCTRL_RE |